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oak

Pronunciation: (ōk),[key]—n.1. any tree or shrub belonging to the genus Quercus, of the beech family, bearing the acorn as fruit.
2. the hard, durable wood of such a tree, used in making furniture and in construction.
3. the leaves of this tree, esp. as worn in a chaplet.
4. anything made of the wood of this tree, as an item of furniture, a door, etc.
5. sport one's oak,Brit.(of a university student) to indicate that one is not at home to visitors by closing the outer door of one's lodgings.